Has anyone got this upgrade? If so was it worth it? I just got my v2-400's a couple of days ago, and now im reading about this new upgrade and I dont really want to spend another $50 especially if it doesent change anything other then add headphone port and on/off switch. the power switch would be nice but not work $50 to me. If it improves the overall soundquality, then i would buy it. Can anyone help me out here? Thanks in advance.